Thermal Zones Modelling for an Energy Efficient Commercial Building – Case Study Elena Camelia Tamaş (Papuc), Dragoş Hera, Gianni Flamaropol and Graţiela Maria Ţârlea E3S Web Conf., 111 (2019) 03034 Published online: 13 August 2019 DOI: 10.1051/e3sconf/201911103034